/* =========================================================
   yesang.org — Forecast-Journal stylesheet
   Aesthetic: 19th-century meteorological instruments,
   layered atmospheric parallax, scholarly serif typography.
   ========================================================= */

:root {
    --c-deep-slate:      #1E2A3A;
    --c-storm-gray:      #4A5568;
    --c-barometric-blue: #2C5282;
    --c-cirrus-white:    #F7F8FA;
    --c-low-pressure:    #C53030;
    --c-high-pressure:   #2B6CB0;
    --c-brass-gold:      #B8972E;
    --c-fog-gray:        #CBD5E0;

    --f-display: 'Playfair Display', 'Lora', Georgia, serif;
    --f-body:    'Lora', Georgia, serif;
    --f-mono:    'Fira Mono', 'Courier New', monospace;
    --f-italic:  'Spectral', 'Lora', Georgia, serif;

    --max-col: 580px;
    --col-left: 15%;
    --col-left-min: 80px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--c-cirrus-white);
    color: var(--c-storm-gray);
    font-family: var(--f-body);
    font-size: 18px;
    line-height: 1.8;
    overflow-x: hidden;
    /* subtle paper grain via radial wash */
    background-image:
        radial-gradient(ellipse at 20% 10%, rgba(184, 151, 46, 0.025), transparent 55%),
        radial-gradient(ellipse at 90% 90%, rgba(44, 82, 130, 0.03), transparent 60%);
    background-attachment: fixed;
    min-height: 100vh;
    position: relative;
}

/* =========================================================
   PARALLAX LAYERS
   ========================================================= */

.layer {
    position: fixed;
    inset: 0;
    pointer-events: none;
    will-change: transform;
    z-index: 1;
    overflow: visible;
}

.layer-background { z-index: 1; }
.layer-midground  { z-index: 2; }

.layer svg {
    width: 100%;
    height: 600vh; /* tall canvas covering all 5 zones (~5 * 120vh) */
    display: block;
}

/* Background isobars */
.isobar-field ellipse {
    fill: none;
    stroke: var(--c-fog-gray);
    stroke-width: 1;
    opacity: 0.20;
}

.isobar-field .iso-letter {
    font-family: var(--f-mono);
    font-size: 12px;
    fill: var(--c-fog-gray);
    opacity: 0.55;
    text-anchor: middle;
    dominant-baseline: middle;
    letter-spacing: 0.04em;
}

.isobar-field .isobar-group {
    transform-origin: center;
}

.isobar-field .isobar-group[data-zone="1"] { animation: drift-a 52s ease-in-out infinite; }
.isobar-field .isobar-group[data-zone="2"] { animation: drift-b 47s ease-in-out infinite; }
.isobar-field .isobar-group[data-zone="3"] { animation: drift-a 60s ease-in-out infinite; }
.isobar-field .isobar-group[data-zone="4"] { animation: drift-b 44s ease-in-out infinite; }
.isobar-field .isobar-group[data-zone="5"] { animation: drift-a 56s ease-in-out infinite; }

@keyframes drift-a {
    0%, 100% { transform: translateX(0); }
    50%      { transform: translateX(14px); }
}
@keyframes drift-b {
    0%, 100% { transform: translateX(0); }
    50%      { transform: translateX(-12px); }
}

/* Midground probability curves */
.curve-field .curve-fill {
    fill: var(--c-barometric-blue);
    opacity: 0;
    transition: opacity 1600ms ease-in-out;
}

.curve-field .curve-line {
    fill: none;
    stroke: var(--c-barometric-blue);
    stroke-width: 1.4;
    opacity: 0.65;
    /* dashed for path-draw animation, length ~1800 */
    stroke-dasharray: 1800;
    stroke-dashoffset: 1800;
    transition: stroke-dashoffset 2000ms cubic-bezier(0.4, 0.0, 0.2, 1);
}

.curve-field .curve-line-faint {
    stroke-width: 1;
    opacity: 0.30;
    stroke-dasharray: 4 6;
}

.curve-field .curve-axis {
    stroke: var(--c-fog-gray);
    stroke-width: 0.6;
    opacity: 0.55;
}

.curve-field .curve-mean {
    stroke: var(--c-brass-gold);
    stroke-width: 0.8;
    stroke-dasharray: 3 4;
    opacity: 0.55;
}

.curve-field .curve-label {
    font-family: var(--f-mono);
    font-size: 12px;
    fill: var(--c-brass-gold);
    letter-spacing: 0.05em;
}

/* on-reveal classes (toggled by JS) */
.curve-group.is-revealed .curve-fill { opacity: 0.15; }
.curve-group.is-revealed .curve-line { stroke-dashoffset: 0; }

/* =========================================================
   FOREGROUND TEXT LAYER
   ========================================================= */

.layer-foreground {
    position: relative;
    z-index: 5;
}

/* =========================================================
   BAROMETER (left edge progress)
   ========================================================= */

.barometer {
    position: fixed;
    top: 0;
    left: 36px;
    width: 30px;
    height: 100vh;
    z-index: 10;
    pointer-events: none;
}

@media (max-width: 900px) {
    .barometer { left: 14px; width: 24px; }
}

.barometer-svg {
    width: 30px;
    height: 100vh;
    display: block;
    overflow: visible;
}

.barometer-mercury {
    filter: drop-shadow(0 0 6px rgba(184, 151, 46, 0.55));
    transition: cy 80ms linear;
}

.barometer-label {
    position: absolute;
    top: 14px;
    left: -2px;
    transform: rotate(-90deg);
    transform-origin: 0 0;
    font-family: var(--f-mono);
    font-size: 10px;
    color: var(--c-brass-gold);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    white-space: nowrap;
    opacity: 0.70;
}

.barometer-label span {
    margin-left: 6px;
    color: var(--c-storm-gray);
    opacity: 0.7;
}

/* =========================================================
   SITE HEADER
   ========================================================= */

.site-header {
    position: relative;
    padding: 36px 60px 0 calc(var(--col-left) + 60px);
    margin-bottom: 8vh;
}

@media (max-width: 900px) {
    .site-header {
        padding: 28px 28px 0 60px;
    }
}

.site-header-inner {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 32px;
    flex-wrap: wrap;
    border-bottom: 0.5px solid var(--c-fog-gray);
    padding-bottom: 18px;
    max-width: 1100px;
}

.site-mark {
    display: flex;
    align-items: baseline;
    gap: 16px;
}

.site-mark-glyph {
    font-family: var(--f-display);
    font-weight: 700;
    font-size: 30px;
    color: var(--c-deep-slate);
    letter-spacing: 0.04em;
}

.site-mark-domain {
    font-family: var(--f-mono);
    font-size: 12px;
    color: var(--c-brass-gold);
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.site-nav {
    display: flex;
    gap: 22px;
    font-family: var(--f-mono);
    font-size: 12px;
    letter-spacing: 0.14em;
}

.site-nav a {
    color: var(--c-storm-gray);
    text-decoration: none;
    padding-bottom: 2px;
    border-bottom: 0.5px solid transparent;
    transition: color 320ms ease, border-color 320ms ease;
}

.site-nav a:hover,
.site-nav a.is-active {
    color: var(--c-brass-gold);
    border-bottom-color: var(--c-brass-gold);
}

.site-meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-family: var(--f-mono);
    font-size: 11px;
    color: var(--c-storm-gray);
    letter-spacing: 0.10em;
    text-align: right;
}

.site-meta-row span:first-child {
    color: var(--c-brass-gold);
    margin-right: 8px;
    text-transform: uppercase;
    letter-spacing: 0.18em;
}

/* =========================================================
   ZONES
   ========================================================= */

.zone {
    position: relative;
    min-height: 120vh;
    padding: 14vh calc(var(--col-left) + 60px) 14vh calc(var(--col-left) + 60px);
    max-width: 1180px;
}

@media (max-width: 900px) {
    .zone {
        padding: 10vh 28px 10vh 60px;
        min-height: 110vh;
    }
}

.zone-marker {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 38px;
    font-family: var(--f-mono);
    font-size: 12px;
    color: var(--c-brass-gold);
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.zone-numeral {
    font-family: var(--f-display);
    font-weight: 700;
    font-size: 16px;
    color: var(--c-deep-slate);
    letter-spacing: 0.12em;
}

.zone-rule {
    flex: 0 0 auto;
    width: 80px;
    height: 0.5px;
    background: var(--c-brass-gold);
    opacity: 0.6;
}

.zone-coords {
    font-size: 11px;
    color: var(--c-storm-gray);
    opacity: 0.85;
    letter-spacing: 0.16em;
}

.zone-title {
    font-family: var(--f-display);
    font-weight: 700;
    font-size: clamp(38px, 5.2vw, 64px);
    line-height: 1.05;
    color: var(--c-deep-slate);
    letter-spacing: -0.005em;
    max-width: 720px;
    margin-bottom: 18px;
}

.zone-subtitle {
    font-family: var(--f-italic);
    font-style: italic;
    font-size: 21px;
    line-height: 1.5;
    color: rgba(30, 42, 58, 0.62);
    letter-spacing: 0.01em;
    max-width: var(--max-col);
    margin-bottom: 56px;
}

.zone-prose {
    max-width: var(--max-col);
    position: relative;
}

.zone-prose p {
    font-family: var(--f-body);
    font-size: 18px;
    line-height: 1.85;
    color: var(--c-storm-gray);
    margin-bottom: 1.6em;
}

.zone-prose p:last-of-type {
    margin-bottom: 0;
}

.zone-epigraph {
    font-family: var(--f-italic) !important;
    font-style: italic;
    font-size: 22px !important;
    line-height: 1.55 !important;
    color: rgba(30, 42, 58, 0.70) !important;
    letter-spacing: 0.01em;
    border-left: 0.5px solid var(--c-brass-gold);
    padding: 4px 0 4px 24px;
    margin: 28px 0 32px !important;
}

.zone-han {
    font-family: var(--f-display);
    font-weight: 700;
    color: var(--c-deep-slate);
    letter-spacing: 0.04em;
    padding: 0 4px;
}

.zone-readings {
    display: flex;
    gap: 36px;
    margin-top: 56px;
    padding-top: 22px;
    border-top: 0.5px solid var(--c-fog-gray);
    flex-wrap: wrap;
}

.reading {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.reading-label {
    font-family: var(--f-mono);
    font-size: 10px;
    color: var(--c-brass-gold);
    letter-spacing: 0.20em;
    text-transform: uppercase;
}

.reading-value {
    font-family: var(--f-mono);
    font-size: 18px;
    color: var(--c-deep-slate);
    letter-spacing: 0.04em;
}

/* Zone-specific accents */
.zone[data-zone="2"] .reading-value:nth-child(2),
.zone[data-zone="2"] .reading:nth-child(3) .reading-value {
    color: var(--c-low-pressure);
}

.zone[data-zone="4"] .reading:nth-child(2) .reading-value {
    color: var(--c-high-pressure);
}

.zone[data-zone="5"] .reading:nth-child(3) .reading-value {
    color: var(--c-brass-gold);
}

/* =========================================================
   INSTRUMENT DIALS (corner decorations)
   ========================================================= */

.instrument {
    position: absolute;
    width: 140px;
    height: 140px;
    opacity: 0.40;
    pointer-events: none;
}

.instrument circle,
.instrument line,
.instrument path {
    fill: none;
    stroke: var(--c-brass-gold);
    stroke-width: 0.8;
}

.instrument .dial-needle {
    stroke-width: 1.2;
}

.instrument .dial-label {
    font-family: var(--f-mono);
    font-size: 8px;
    fill: var(--c-brass-gold);
    letter-spacing: 0.20em;
    stroke: none;
}

.instrument-tl {
    top: 8vh;
    right: 6vw;
}

.instrument-tr {
    top: 8vh;
    right: 6vw;
}

@media (max-width: 900px) {
    .instrument {
        width: 100px;
        height: 100px;
        right: 12px;
        top: 4vh;
        opacity: 0.30;
    }
}

/* =========================================================
   FOOTER
   ========================================================= */

.site-footer {
    margin-top: 14vh;
    max-width: var(--max-col);
    color: var(--c-storm-gray);
    font-family: var(--f-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.footer-rule {
    height: 0.5px;
    background: var(--c-brass-gold);
    opacity: 0.5;
    margin-bottom: 18px;
    width: 100%;
}

.footer-row {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    padding: 6px 0;
    flex-wrap: wrap;
}

.footer-row-faint {
    color: rgba(74, 85, 104, 0.55);
    border-top: 0.5px solid var(--c-fog-gray);
    margin-top: 8px;
    padding-top: 12px;
    font-style: italic;
    text-transform: none;
    font-family: var(--f-italic);
    letter-spacing: 0.04em;
    font-size: 13px;
}

/* =========================================================
   ZONE REVEAL — fade text on enter viewport
   ========================================================= */

.zone-title,
.zone-subtitle,
.zone-prose,
.zone-marker {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 1200ms ease-out, transform 1200ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.zone.is-revealed .zone-title,
.zone.is-revealed .zone-subtitle,
.zone.is-revealed .zone-prose,
.zone.is-revealed .zone-marker {
    opacity: 1;
    transform: translateY(0);
}

.zone.is-revealed .zone-subtitle { transition-delay: 180ms; }
.zone.is-revealed .zone-prose    { transition-delay: 320ms; }

/* Instrument dials gentle slow rotation cue */
.instrument .dial-needle {
    transform-origin: 80px 80px;
    animation: needle-sway 24s ease-in-out infinite;
}

@keyframes needle-sway {
    0%, 100% { transform: rotate(0deg); }
    50%      { transform: rotate(-8deg); }
}

/* =========================================================
   SELECTION
   ========================================================= */

::selection {
    background: rgba(184, 151, 46, 0.30);
    color: var(--c-deep-slate);
}